Milliampere is ...

Milliampere is ...

• A. One one-thousandth (1/1000) of an ampere; a unit of measurement used to describe the intensity of an electrical current.
• B. A measure of x-ray beam energy.
• C. A unit of exposure time.
• D. A unit of image sharpness.

Answer: (A)

Milliampere is a unit that measures electric current. It equals one thousandth of an ampere, which is the standard unit for current. The symbol mA is used for this smaller amount of current, so it describes how much current is flowing per unit time. In imaging contexts, milliampere helps control exposure together with time (the product is called mAs). This isn’t a measure of x-ray beam energy (that relates to kVp), nor is it a measure of exposure time (seconds) or image sharpness.

Milliampere is a unit that measures electric current. It equals one thousandth of an ampere, which is the standard unit for current. The symbol mA is used for this smaller amount of current, so it describes how much current is flowing per unit time. In imaging contexts, milliampere helps control exposure together with time (the product is called mAs). This isn’t a measure of x-ray beam energy (that relates to kVp), nor is it a measure of exposure time (seconds) or image sharpness.